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food bodies for the ants in return for this defense. we've come down to the side here. you can see the ants are getting agitated by me breaking the leaf. but you can see these holes in the stem. the ants come in and out of the stem. so the whole stem is hollow. the ants will continue to defend this colony from a wide range of herbivores, a wide range of insects, that will eat the leaves of the plant. narrator: the researchers explore hoso many different species all competing for the same resources can coexist. one way the trees have adapted is that they become specialists, surviving in niche condions. specialition is one hypothesis for how diversity is maintained. we're standing in the middle of a forest gap. it's the result of this huge tree here which died. it died standing. it dropped all its branches. it cleared a big opening in the understory, killed small trees, and left a big opening in the canopy. and in that ening, a rush of trees germinates and establishes. and we call those trees -- they're very fast-growing -- we call them pioneers. they pioneer the new gap. and they're
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